138782605 has 8 divisors (see below), whose sum is σ = 179349912. Its totient is φ = 102485568.

The previous prime is 138782591. The next prime is 138782627. The reversal of 138782605 is 506287831.

It can be written as a sum of positive squares in 4 ways, for example, as 2056356 + 136726249 = 1434^2 + 11693^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 138782605 - 2⁷ = 138782477 is a prime.

It is a super-2 number, since 2×138782605² = 38521222901172050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1067494 + ... + 1067623.

It is an arithmetic number, because the mean of its divisors is an integer number (22418739).

Almost surely, 2^138782605 is an apocalyptic number.

It is an amenable number.

138782605 is a deficient number, since it is larger than the sum of its proper divisors (40567307).

138782605 is a wasteful number, since it uses less digits than its factorization.

138782605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2135135.

The product of its (nonzero) digits is 80640, while the sum is 40.

The square root of 138782605 is about 11780.6029132638. The cubic root of 138782605 is about 517.7399511134.

The spelling of 138782605 in words is "one hundred thirty-eight million, seven hundred eighty-two thousand, six hundred five".